Dispersion state and oxygen storage capacity properties of ceria and zirconia nanoparticles supported on alumina by the impregnation process

Abstract

The characterization of the phase and oxygen storage capacity of ZrO2, CeO2, and mixed oxides, which were supported on Al2O3 by the impregnation method, was performed for the development of a better sub-catalyst in the exhaust treatment. Regarding the dispersion on the alumina support, the behavior of ZrO2 is different from that of CeO2; CeO2 becomes crystalline nanoparticles on Al2O3, while majority of ZrO2 do not form well-structured particles. We found that the oxygen storage capacity of cerium was improved by the addition of ZrO2 to CeO2 in the case of alumina-supported mixed oxides.